Noise control

Abstract

Methods, devices, and/or systems for controlling vibration and/or acoustic noise. An exemplary method senses noise and/or, for example, rotational speed of a rotating shaft, determines control parameters and actuates one or more actuators. An exemplary device includes a controller configured to receive information, determine control parameters and actuate one or more actuators. An exemplary system includes one or more sensors, a processor and one or more actuators. Various exemplary methods, devices, and/or systems are optionally suitable for use with turbochargers and/or other boost systems.

1. A method of reducing noise, the method comprising:
 sensing noise in an exhaust of an internal combustion engine wherein the sensing noise occurs downstream from a rotating, exhaust driven turbine; 
 sensing or determining rotating speed of the rotating turbine; 
 determining one or more actuator control parameters based on information wherein the information comprises information acquired by the sensing noise and information acquired by the sensing or determining rotating speed; and 
 actuating one or more actuators using the one or more actuator control parameters to reduce the noise, wherein the noise includes noise stemming from a turbocharger. 
 
   
   
     2. The method of  claim 1 , wherein a known relationship exists between rotating speed of the turbine and noise generated by the turbine. 
   
   
     3. The method of  claim 1 , further comprising sensing noise in a combustion gas intake. 
   
   
     4. One or more computer-readable media having computer-readable instructions thereon which, when executed by a programmable device, perform the method of  claim 1 . 
   
   
     5. A system for reducing noise, the system comprising:
 sensor means for sensing noise in an exhaust of an internal combustion engine wherein the sensing noise occurs downstream from a rotating, exhaust driven turbine; 
 sensor or determination means for sensing or determining rotating speed of the rotating turbine; 
 determination means for determining one or more actuator control parameters based on information wherein the information comprises information acquired by the sensor means for sensing noise and information acquired by the sensor or determination means for sensing or determining rotating speed; and 
 actuation means for actuating one or more actuators using the one or more actuator control parameters to reduce the noise, wherein the noise includes noise stemming from a turbocharger. 
 
   
   
     6. The system of  claim 5 , wherein the sensor means includes one or more sensors configured to sense pressure waveforms. 
   
   
     7. The system of  claim 5 , wherein the determination means includes a processor configured to determine one or more actuator control parameter. 
   
   
     8. The system of  claim 5 , wherein the actuation means includes one or more actuators configured to generate pressure waveforms. 
   
   
     9. A system configured to reduce noise, the system comprising:
 one or more sensors configured to sense noise in an exhaust of an internal combustion engine wherein the one or more sensors sense noise downstream from an exhaust driven turbine having a rotation speed; 
 a processor operatively coupled to receive information from the one or more sensors and to receive the rotation speed and configured to determine one or more actuator control parameters based on information wherein the information comprises information received from the more or more sensors and the rotation speed; and 
 one or more actuators operatively coupled to receive the one or more actuator control parameters from the processor and configured to generate waveforms based at least in part on the one or more actuator control parameters, wherein the noise includes noise stemming from a turbocharger. 
 
   
   
     10. A device comprising:
 a controller, the controller configured to receive information from one or more sensors, the information pertaining to noise sensed in an exhaust of an internal combustion engine, the noise sensed downstream from an exhaust driven turbine, the turbine having a rotation speed and the noise including noise stemming from a turbocharger; the controller further configured to determine one or more actuator control parameters based on information that comprises the information pertaining to noise and the rotation speed; and the controller yet further configured to transmit the one or more actuator control parameters to one or more actuators.